Crown Audio by Harman




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How do I reduce breath pops with the CM-311AE?

I am using a CM311AE with a wireless system. I like the sound except that the mic seems to be sensitive to pops from those pesky P's, S's, T's, CH sounds, etc. I'm using a compressor. Any suggestions?
Steve Askins

Reply: The output of the CM-311AE goes way up when the mouth is touching the foam pop filter. This makes the signal override the pops better. So it helps to use the mic with lips touching the filter.

Since breath pops are strong in the low frequencies, they can be reduced with a low-cut filter (highpass filter). Set it to the highest frequency that does not make your voice sound thin or excessively weak in the bass. For example, start at 200 Hz. If that sounds too weak in the bass, bring it down to 150 or 100 Hz.

If gain-before-feedback and isolation are not issues for you, the mic could be moved to the corner of the mouth so that breath pops will not hit the mic. However, you will need to touch up EQ to get a good sound when the mic is in that location.

A breath pop is a strong transient (mostly low frequencies) at the beginning of words starting with plosives (p, b, t). So the attack-time setting on the compressor could be critical. Try a shorter attack time to catch that transient. (Some compressors do not have an attack-time setting). If the attack time is long (over 10 msec), maybe the pop is uncompressed but the voiced sounds are being compressed relative to the pop. 

Also, try bypassing the compressor to see if the pops diminish. Try a higher threshold setting on the compressor, so that low-level signals are not brought up in gain so much